期刊
FUEL PROCESSING TECHNOLOGY
卷 112, 期 -, 页码 70-75出版社
ELSEVIER
DOI: 10.1016/j.fuproc.2013.02.012
关键词
Glycerol ethers; Rare earth; H beta-zeolite; Ion exchange
资金
- National Basic Research Program of China (973 Program) [2009CB219906]
- Key Project of National High Technology Research and Development Program (863 Program) of China [2009AA050703]
- National Natural Science Foundation of China [21276203]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20110201130002]
Rare earth (RE) modified H beta-zeolites were prepared by ion exchange with various rare earth cations (La3+, Ce3+, Nd3+ and Eu3+), and investigated for the etherification of glycerol with isobutylene to synthesize glycerol ethers. XRD, EDS, BET and NH3-TPD analysis methods had been used to characterize these catalysts. The analytic results indicate that the surface strong acidity was enhanced by RE-ion exchange while the framework structure of H beta-zeolites was slightly changed. Among all modified H beta-zeolites, Nd/H beta-zeolite had the highest quantity of Bronsted acid sites which would be helpful for etherification, and exhibited the best catalytic performance. Under the optimal reaction conditions of isobutylene to glycerol of 3:1, a catalyst-to-glycerol mass ratio of 6 wt.%, a reaction temperature of 343 K, and a reaction time of 2 h, 92% glycerol was transformed into a mixture of glycerol ethers including mono-tert-butyl ethers of glycerol (MTBGs), di-tert-butyl ethers of glycerol (DTBGs) and tri-tert-butyl ether of glycerol (TTBG). The selectivity toward the desired DTBG and TTBG were 65% and 8%, respectively. (C) 2013 Elsevier B.V. All rights reserved.
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